Resource Determination in Wireless Communications

This patent document is a continuation of U.S. application Ser. No. 17/986,555, filed on Nov. 14, 2022, which is a continuation of and claims benefit of priority to International Patent Application No. PCT/CN2020/090214, filed on May 14, 2020. The entire content of the before-mentioned patent applications are incorporated by reference as part of the disclosure of this application.

This patent document is directed generally to wireless communications.

Mobile communication technologies are moving the world toward an increasingly connected and networked society. The rapid growth of mobile communications and advances in technology have led to greater demand for capacity and connectivity. Other aspects, such as energy consumption, device cost, spectral efficiency, and latency are also important to meeting the needs of various communication scenarios. Various techniques, including new ways to provide higher quality of service, are being discussed.

This document discloses methods, systems, and devices related to digital wireless communication, and more specifically, to techniques related to maintaining a PDCCH blind decoding budget in the case that a cell can be scheduled by another cell and by itself.

In one exemplary aspect, a method for wireless communication is disclosed. The method includes receiving, by a terminal on a scheduling cell, control information for a first cell according to a rule that an amount of blind decoding resources for the first cell does not exceed a budget, wherein the first cell is scheduled by the scheduling cell and the first cell is also scheduled by itself.

In another exemplary aspect, a wireless communications apparatus comprising a processor is disclosed. The processor is configured to implement a method described herein.

In yet another exemplary aspect, the various techniques described herein may be embodied as processor-executable code and stored on a computer-readable program medium.

The details of one or more implementations are set forth in the accompanying attachments, the drawings, and the description below. Other features will be apparent from the description and drawings, and from the clauses.

The development of the new generation of wireless communication—5G New Radio (NR) communication—is a part of a continuous mobile broadband evolution process to meet the requirements of increasing network demand. NR will provide greater throughput to allow more users connected at the same time. Other aspects, such as energy consumption, device cost, spectral efficiency, and latency are also important to meeting the needs of various communication scenarios.

Theth Generation mobile communication technology (4G) Long-Term Evolution (LTE) or LTE-Advance (LTE-A) and the 5th Generation mobile communication technology (5G) face more and more demands. Based on the current development trend, 4G and 5G systems are developing supports for features of enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine-type communication (mMTC). Further, a spectrum used for 4G can be reused for 5G by dynamic spectrum sharing (DSS).

In current 5G systems, a SCell can be the only scheduling cell or scheduled cell, while the PCell (or SCell) may include a scheduling cell and may not be a scheduled cell. In the case that the PCell (or SCell) can be a scheduled cell, the total PDCCH blind decoding budget may not be changed. A scheduling cell is responsible for scheduling transmissions over the wireless medium both from the network and to the network.

For the 5th Generation mobile communication technology, a physical downlink control channel (PDCCH) of a primary cell PCell (or primary secondary cell group cell PSCell) can schedule a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH) on a PSCell, but PDSCH or PUSCH on P(S)Cell may not be scheduled by PDCCH of the SCell. Considering DSS in NR, resources for a PDCCH of a PCell/SCell may be restricted. For offloading the PCell/SCell PDCCH, NR PDCCH enhancements for cross-carrier scheduling including PDCCH of SCell scheduling PDSCH or PUSCH on P(S)Cell may be introduced. Particularly, a total PDCCH blind decoding budget may be unchanged.

In the case that a P(S)Cell is a scheduled cell (or a scheduling cell) a total PDCCH blind decoding budget may be unchanged. The total PDCCH blind decoding budget may include a minimum of two parameters, which is discussed in greater detail below.

In the case that the P(S)Cell is scheduled by a SCell, a candidate for monitoring to avoid an increase in the PDCCH blind decoding budget/complexity may be determined based on any of the methods described below.

A first method can include, in the case that search space sharing for DL (UL) is supported by a UE, at least one scheduled SCell with same size of DCI format 0_1/1_1 as that of DCI format 0_1/1_1 on PCell can be configured. For PDCCH blind decoding for the scheduled PCell and the scheduled SCell on the scheduling cell, only blind decoding in the USS for the scheduled SCell is performed.

A second method can include configuring M1 candidates for self-scheduling and M2 candidates for cross-carrier scheduling for a same cell. This can include the candidates being configured in a search space that are used for self-scheduling and also used for cross-carrier scheduling. This also can include the candidates being configured in a search space are used for cross-carrier scheduling in addition to the candidates configured for self-scheduling. This also can include the candidates being configured in a search space are only used for cross-carrier scheduling or for self-scheduling. In addition, the total candidates for a USS can include the candidates of nrofCandidates (if any) and nrofCandidates-r17 (if any).

A third method can include configuring (or predefining) an order of blind decoding for a cell. An order of the blind decoding can include first performing self-scheduling blind decoding then performing cross-carrier scheduling blind decoding. The order can also include first performing cross-carrier scheduling blind decoding and then performing self-scheduling blind decoding. Self-scheduling and cross-carrier scheduling can both be supported for the cell.

A fourth method can include the candidates for monitoring being used for cross-carrier scheduling for P(S)Cell that are counted in the candidates for monitoring used for self-scheduling for SCell.

In the case that a P(S)Cell can be scheduled by SCell, to maintain the cell number of P(S)Cell as 1 for both self-scheduling and cross-carrier scheduling includes one of the following methods. A first method can include the PCell only being counted into one cell as the scheduling cell for PCell or scheduled cell for its scheduling cell. A second method can include the PCell being counted as a P1 cell as the scheduling cell for PCell and a P2 cell as scheduled cell for its scheduling cell. In such an instance, P1 and P2 can equal 1. P1 and P2 can be determined by one of following schemes. A first scheme can include P1/P2=M1/M2, wherein M1 is the candidate for self-scheduling and M2 is the candidate for cross-carrier scheduling for a same cell. A second scheme can include configuring P1 and/or P2.

There may be two PDCCH blind decoding parameters, one may include

while the other can include

For each scheduled cell, the UE may not be required to monitor on the active DL bandwidth part (BWP) with a SCS configuration μ of the scheduling cell more than

PDCCH candidates or more than

non-overlapped CCEs per slot. The budget can be a minimum of two parameters.

Table 1 as provided below provides a maximum number of monitored PDCCH candidates,

per slot for a UE in a DL BWP with SCS configuration μ for operation with a single serving cell.

Table 2 can provide the maximum number of non-overlapped CCEs,

for a DL BWP with SCS configuration μ that a UE is expected to monitor corresponding PDCCH candidates per slot for operation with a single serving cell.

CCEs for PDCCH candidates can be non-overlapped if they correspond to different CORESET indexes, or different first symbols for the reception of the respective PDCCH candidates.

If a UE is configured with

downlink cells with DL BWPs having SCS configuration μ where

the UE may not be required to monitor, on the active DL BWP of the scheduling cell, more than

PDCCH candidates or more than

non-overlapped CCEs per slot for each scheduled cell.

If a UE is configured with

downlink cells with DL BWPs having SCS configuration μ, where